/*
 * The MIT License
 *
 * Copyright (c) 2011 Takahiro Hashimoto
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package jp.a840.websocket.util;

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.util.logging.Logger;

import jp.a840.websocket.impl.WebSocketBase;

/**
 * The Class PacketDumpUtil.
 *
 * @author Takahiro Hashimoto
 */
public class PacketDumpUtil {
    /**
     * The Constant FR_DOWN.
     */
    public static final int FR_DOWN = 1 << 0;

    /**
     * The Constant HS_DOWN.
     */
    public static final int HS_DOWN = 1 << 1;

    /**
     * The Constant FR_UP.
     */
    public static final int FR_UP = 1 << 2;

    /**
     * The Constant HS_UP.
     */
    public static final int HS_UP = 1 << 3;

    /**
     * The Constant ALL.
     */
    public static final int ALL = FR_DOWN | HS_DOWN | FR_UP | HS_UP;


    /**
     * The log.
     */
    private static Logger log = Logger.getLogger(PacketDumpUtil.class.getName());

    /**
     * Checks if is dump.
     *
     * @param mode the mode
     * @return true, if is dump
     */
    public static boolean isDump(int mode) {
        return (WebSocketBase.getPacketDumpMode() & mode) > 0;
    }

    /**
     * Prints the packet dump.
     *
     * @param title  the title
     * @param buffer the buffer
     */
    public static void printPacketDump(String title, ByteBuffer buffer) {
        buffer.mark();

        // 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
        int count = 0;
        String header = "               4         8        12        16";

        StringBuilder dump = new StringBuilder();
        dump.append(title);
        dump.append("\n");
        dump.append(header);
        dump.append("\n");
        while (buffer.hasRemaining()) {
            byte[] line = new byte[16];
            StringBuilder dumpLine = new StringBuilder();
            dumpLine.append(StringUtil.lpad(Integer.toHexString(16 * count++), 5, "0"));
            dumpLine.append(":");
            int length = Math.min(buffer.remaining(), line.length);
            buffer.get(line, 0, length);
            for (int i = 0; i < length; i++) {
                if (i % 2 == 0) {
                    dumpLine.append(" ");
                }
                dumpLine.append(StringUtil.lpad(StringUtil.toHexString(line[i]), 2, "0"));
            }
            dumpLine.append(" ");
            dump.append(StringUtil.rpad(dumpLine, header.length() + 3, " ") + dumpStr(line, length));
            dump.append("\n");
        }
        log.info(dump.toString());
        buffer.reset();
    }

    /**
     * Dump str.
     *
     * @param bytes  the bytes
     * @param length the length
     * @return the string
     */
    private static String dumpStr(byte[] bytes, int length) {
        CharBuffer buf = CharBuffer.allocate(length);

        for (int i = 0; i < length; i++) {
            if ((0x00 <= bytes[i] && bytes[i] <= 0x1F) || bytes[i] == 0x7F || (bytes[i] & 0x80) > 0) {
                buf.put(i, (char) 0x2E);
            } else {
                buf.put(i, (char) bytes[i]);
            }
        }
        return buf.toString();
    }

    /**
     * The main method.
     *
     * @param args the arguments
     * @throws Exception the exception
     */
    public static void main(String[] args) throws Exception {
        ByteBuffer buf = ByteBuffer.allocate(64);
        buf.put("01234567890-+=\n\rabcdefg".getBytes());
        buf.flip();
        printPacketDump("TEST", buf);
    }

}
